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![Xin Gao](/assets/img/avatar_default.png)
The double `if' is duplicated in line 104, remove one. Signed-off-by: Xin Gao <gaoxin@cdjrlc.com> Signed-off-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20220722194639.18545-1-gaoxin@cdjrlc.com
601 lines
18 KiB
C
601 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
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*/
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#include <linux/dcache.h>
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#include <linux/fs.h>
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/srcu.h>
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#include <linux/fsnotify_backend.h>
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#include "fsnotify.h"
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/*
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* Clear all of the marks on an inode when it is being evicted from core
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*/
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void __fsnotify_inode_delete(struct inode *inode)
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{
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fsnotify_clear_marks_by_inode(inode);
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}
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EXPORT_SYMBOL_GPL(__fsnotify_inode_delete);
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void __fsnotify_vfsmount_delete(struct vfsmount *mnt)
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{
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fsnotify_clear_marks_by_mount(mnt);
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}
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/**
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* fsnotify_unmount_inodes - an sb is unmounting. handle any watched inodes.
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* @sb: superblock being unmounted.
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*
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* Called during unmount with no locks held, so needs to be safe against
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* concurrent modifiers. We temporarily drop sb->s_inode_list_lock and CAN block.
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*/
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static void fsnotify_unmount_inodes(struct super_block *sb)
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{
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struct inode *inode, *iput_inode = NULL;
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spin_lock(&sb->s_inode_list_lock);
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list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
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/*
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* We cannot __iget() an inode in state I_FREEING,
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* I_WILL_FREE, or I_NEW which is fine because by that point
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* the inode cannot have any associated watches.
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*/
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spin_lock(&inode->i_lock);
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if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) {
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spin_unlock(&inode->i_lock);
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continue;
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}
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/*
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* If i_count is zero, the inode cannot have any watches and
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* doing an __iget/iput with SB_ACTIVE clear would actually
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* evict all inodes with zero i_count from icache which is
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* unnecessarily violent and may in fact be illegal to do.
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* However, we should have been called /after/ evict_inodes
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* removed all zero refcount inodes, in any case. Test to
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* be sure.
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*/
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if (!atomic_read(&inode->i_count)) {
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spin_unlock(&inode->i_lock);
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continue;
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}
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__iget(inode);
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spin_unlock(&inode->i_lock);
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spin_unlock(&sb->s_inode_list_lock);
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iput(iput_inode);
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/* for each watch, send FS_UNMOUNT and then remove it */
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fsnotify_inode(inode, FS_UNMOUNT);
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fsnotify_inode_delete(inode);
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iput_inode = inode;
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cond_resched();
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spin_lock(&sb->s_inode_list_lock);
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}
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spin_unlock(&sb->s_inode_list_lock);
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iput(iput_inode);
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}
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void fsnotify_sb_delete(struct super_block *sb)
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{
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fsnotify_unmount_inodes(sb);
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fsnotify_clear_marks_by_sb(sb);
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/* Wait for outstanding object references from connectors */
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wait_var_event(&sb->s_fsnotify_connectors,
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!atomic_long_read(&sb->s_fsnotify_connectors));
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}
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/*
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* Given an inode, first check if we care what happens to our children. Inotify
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* and dnotify both tell their parents about events. If we care about any event
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* on a child we run all of our children and set a dentry flag saying that the
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* parent cares. Thus when an event happens on a child it can quickly tell
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* if there is a need to find a parent and send the event to the parent.
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*/
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void __fsnotify_update_child_dentry_flags(struct inode *inode)
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{
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struct dentry *alias;
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int watched;
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if (!S_ISDIR(inode->i_mode))
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return;
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/* determine if the children should tell inode about their events */
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watched = fsnotify_inode_watches_children(inode);
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spin_lock(&inode->i_lock);
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/* run all of the dentries associated with this inode. Since this is a
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* directory, there damn well better only be one item on this list */
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hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
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struct dentry *child;
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/* run all of the children of the original inode and fix their
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* d_flags to indicate parental interest (their parent is the
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* original inode) */
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spin_lock(&alias->d_lock);
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list_for_each_entry(child, &alias->d_subdirs, d_child) {
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if (!child->d_inode)
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continue;
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spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED);
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if (watched)
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child->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED;
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else
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child->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED;
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spin_unlock(&child->d_lock);
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}
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spin_unlock(&alias->d_lock);
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}
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spin_unlock(&inode->i_lock);
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}
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/* Are inode/sb/mount interested in parent and name info with this event? */
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static bool fsnotify_event_needs_parent(struct inode *inode, struct mount *mnt,
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__u32 mask)
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{
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__u32 marks_mask = 0;
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/* We only send parent/name to inode/sb/mount for events on non-dir */
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if (mask & FS_ISDIR)
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return false;
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/*
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* All events that are possible on child can also may be reported with
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* parent/name info to inode/sb/mount. Otherwise, a watching parent
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* could result in events reported with unexpected name info to sb/mount.
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*/
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BUILD_BUG_ON(FS_EVENTS_POSS_ON_CHILD & ~FS_EVENTS_POSS_TO_PARENT);
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/* Did either inode/sb/mount subscribe for events with parent/name? */
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marks_mask |= fsnotify_parent_needed_mask(inode->i_fsnotify_mask);
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marks_mask |= fsnotify_parent_needed_mask(inode->i_sb->s_fsnotify_mask);
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if (mnt)
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marks_mask |= fsnotify_parent_needed_mask(mnt->mnt_fsnotify_mask);
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/* Did they subscribe for this event with parent/name info? */
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return mask & marks_mask;
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}
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/*
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* Notify this dentry's parent about a child's events with child name info
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* if parent is watching or if inode/sb/mount are interested in events with
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* parent and name info.
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*
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* Notify only the child without name info if parent is not watching and
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* inode/sb/mount are not interested in events with parent and name info.
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*/
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int __fsnotify_parent(struct dentry *dentry, __u32 mask, const void *data,
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int data_type)
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{
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const struct path *path = fsnotify_data_path(data, data_type);
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struct mount *mnt = path ? real_mount(path->mnt) : NULL;
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struct inode *inode = d_inode(dentry);
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struct dentry *parent;
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bool parent_watched = dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED;
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bool parent_needed, parent_interested;
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__u32 p_mask;
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struct inode *p_inode = NULL;
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struct name_snapshot name;
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struct qstr *file_name = NULL;
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int ret = 0;
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/*
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* Do inode/sb/mount care about parent and name info on non-dir?
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* Do they care about any event at all?
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*/
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if (!inode->i_fsnotify_marks && !inode->i_sb->s_fsnotify_marks &&
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(!mnt || !mnt->mnt_fsnotify_marks) && !parent_watched)
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return 0;
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parent = NULL;
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parent_needed = fsnotify_event_needs_parent(inode, mnt, mask);
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if (!parent_watched && !parent_needed)
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goto notify;
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/* Does parent inode care about events on children? */
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parent = dget_parent(dentry);
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p_inode = parent->d_inode;
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p_mask = fsnotify_inode_watches_children(p_inode);
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if (unlikely(parent_watched && !p_mask))
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__fsnotify_update_child_dentry_flags(p_inode);
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/*
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* Include parent/name in notification either if some notification
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* groups require parent info or the parent is interested in this event.
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*/
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parent_interested = mask & p_mask & ALL_FSNOTIFY_EVENTS;
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if (parent_needed || parent_interested) {
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/* When notifying parent, child should be passed as data */
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WARN_ON_ONCE(inode != fsnotify_data_inode(data, data_type));
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/* Notify both parent and child with child name info */
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take_dentry_name_snapshot(&name, dentry);
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file_name = &name.name;
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if (parent_interested)
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mask |= FS_EVENT_ON_CHILD;
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}
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notify:
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ret = fsnotify(mask, data, data_type, p_inode, file_name, inode, 0);
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if (file_name)
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release_dentry_name_snapshot(&name);
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dput(parent);
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return ret;
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}
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EXPORT_SYMBOL_GPL(__fsnotify_parent);
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static int fsnotify_handle_inode_event(struct fsnotify_group *group,
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struct fsnotify_mark *inode_mark,
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u32 mask, const void *data, int data_type,
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struct inode *dir, const struct qstr *name,
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u32 cookie)
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{
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const struct path *path = fsnotify_data_path(data, data_type);
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struct inode *inode = fsnotify_data_inode(data, data_type);
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const struct fsnotify_ops *ops = group->ops;
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if (WARN_ON_ONCE(!ops->handle_inode_event))
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return 0;
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if (WARN_ON_ONCE(!inode && !dir))
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return 0;
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if ((inode_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK) &&
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path && d_unlinked(path->dentry))
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return 0;
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/* Check interest of this mark in case event was sent with two marks */
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if (!(mask & inode_mark->mask & ALL_FSNOTIFY_EVENTS))
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return 0;
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return ops->handle_inode_event(inode_mark, mask, inode, dir, name, cookie);
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}
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static int fsnotify_handle_event(struct fsnotify_group *group, __u32 mask,
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const void *data, int data_type,
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struct inode *dir, const struct qstr *name,
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u32 cookie, struct fsnotify_iter_info *iter_info)
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{
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struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
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struct fsnotify_mark *parent_mark = fsnotify_iter_parent_mark(iter_info);
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int ret;
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if (WARN_ON_ONCE(fsnotify_iter_sb_mark(iter_info)) ||
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WARN_ON_ONCE(fsnotify_iter_vfsmount_mark(iter_info)))
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return 0;
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/*
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* For FS_RENAME, 'dir' is old dir and 'data' is new dentry.
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* The only ->handle_inode_event() backend that supports FS_RENAME is
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* dnotify, where it means file was renamed within same parent.
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*/
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if (mask & FS_RENAME) {
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struct dentry *moved = fsnotify_data_dentry(data, data_type);
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if (dir != moved->d_parent->d_inode)
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return 0;
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}
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if (parent_mark) {
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ret = fsnotify_handle_inode_event(group, parent_mark, mask,
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data, data_type, dir, name, 0);
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if (ret)
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return ret;
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}
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if (!inode_mark)
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return 0;
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if (mask & FS_EVENT_ON_CHILD) {
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/*
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* Some events can be sent on both parent dir and child marks
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* (e.g. FS_ATTRIB). If both parent dir and child are
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* watching, report the event once to parent dir with name (if
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* interested) and once to child without name (if interested).
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* The child watcher is expecting an event without a file name
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* and without the FS_EVENT_ON_CHILD flag.
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*/
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mask &= ~FS_EVENT_ON_CHILD;
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dir = NULL;
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name = NULL;
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}
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return fsnotify_handle_inode_event(group, inode_mark, mask, data, data_type,
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dir, name, cookie);
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}
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static int send_to_group(__u32 mask, const void *data, int data_type,
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struct inode *dir, const struct qstr *file_name,
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u32 cookie, struct fsnotify_iter_info *iter_info)
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{
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struct fsnotify_group *group = NULL;
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__u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS);
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__u32 marks_mask = 0;
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__u32 marks_ignore_mask = 0;
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bool is_dir = mask & FS_ISDIR;
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struct fsnotify_mark *mark;
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int type;
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if (!iter_info->report_mask)
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return 0;
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/* clear ignored on inode modification */
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if (mask & FS_MODIFY) {
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fsnotify_foreach_iter_mark_type(iter_info, mark, type) {
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if (!(mark->flags &
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FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
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mark->ignore_mask = 0;
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}
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}
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/* Are any of the group marks interested in this event? */
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fsnotify_foreach_iter_mark_type(iter_info, mark, type) {
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group = mark->group;
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marks_mask |= mark->mask;
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marks_ignore_mask |=
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fsnotify_effective_ignore_mask(mark, is_dir, type);
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}
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pr_debug("%s: group=%p mask=%x marks_mask=%x marks_ignore_mask=%x data=%p data_type=%d dir=%p cookie=%d\n",
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__func__, group, mask, marks_mask, marks_ignore_mask,
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data, data_type, dir, cookie);
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if (!(test_mask & marks_mask & ~marks_ignore_mask))
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return 0;
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if (group->ops->handle_event) {
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return group->ops->handle_event(group, mask, data, data_type, dir,
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file_name, cookie, iter_info);
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}
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return fsnotify_handle_event(group, mask, data, data_type, dir,
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file_name, cookie, iter_info);
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}
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static struct fsnotify_mark *fsnotify_first_mark(struct fsnotify_mark_connector **connp)
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{
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struct fsnotify_mark_connector *conn;
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struct hlist_node *node = NULL;
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conn = srcu_dereference(*connp, &fsnotify_mark_srcu);
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if (conn)
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node = srcu_dereference(conn->list.first, &fsnotify_mark_srcu);
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return hlist_entry_safe(node, struct fsnotify_mark, obj_list);
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}
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static struct fsnotify_mark *fsnotify_next_mark(struct fsnotify_mark *mark)
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{
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struct hlist_node *node = NULL;
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if (mark)
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node = srcu_dereference(mark->obj_list.next,
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&fsnotify_mark_srcu);
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return hlist_entry_safe(node, struct fsnotify_mark, obj_list);
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}
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/*
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* iter_info is a multi head priority queue of marks.
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* Pick a subset of marks from queue heads, all with the same group
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* and set the report_mask to a subset of the selected marks.
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* Returns false if there are no more groups to iterate.
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*/
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static bool fsnotify_iter_select_report_types(
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struct fsnotify_iter_info *iter_info)
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{
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struct fsnotify_group *max_prio_group = NULL;
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struct fsnotify_mark *mark;
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int type;
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/* Choose max prio group among groups of all queue heads */
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fsnotify_foreach_iter_type(type) {
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mark = iter_info->marks[type];
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if (mark &&
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fsnotify_compare_groups(max_prio_group, mark->group) > 0)
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max_prio_group = mark->group;
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}
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if (!max_prio_group)
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return false;
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/* Set the report mask for marks from same group as max prio group */
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iter_info->current_group = max_prio_group;
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iter_info->report_mask = 0;
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fsnotify_foreach_iter_type(type) {
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mark = iter_info->marks[type];
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if (mark && mark->group == iter_info->current_group) {
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/*
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* FSNOTIFY_ITER_TYPE_PARENT indicates that this inode
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* is watching children and interested in this event,
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* which is an event possible on child.
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* But is *this mark* watching children?
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*/
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if (type == FSNOTIFY_ITER_TYPE_PARENT &&
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!(mark->mask & FS_EVENT_ON_CHILD) &&
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!(fsnotify_ignore_mask(mark) & FS_EVENT_ON_CHILD))
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continue;
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fsnotify_iter_set_report_type(iter_info, type);
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}
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}
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return true;
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}
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/*
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* Pop from iter_info multi head queue, the marks that belong to the group of
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* current iteration step.
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*/
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static void fsnotify_iter_next(struct fsnotify_iter_info *iter_info)
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{
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struct fsnotify_mark *mark;
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int type;
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/*
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* We cannot use fsnotify_foreach_iter_mark_type() here because we
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* may need to advance a mark of type X that belongs to current_group
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* but was not selected for reporting.
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*/
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fsnotify_foreach_iter_type(type) {
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mark = iter_info->marks[type];
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if (mark && mark->group == iter_info->current_group)
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iter_info->marks[type] =
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fsnotify_next_mark(iter_info->marks[type]);
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}
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}
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/*
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* fsnotify - This is the main call to fsnotify.
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*
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* The VFS calls into hook specific functions in linux/fsnotify.h.
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* Those functions then in turn call here. Here will call out to all of the
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* registered fsnotify_group. Those groups can then use the notification event
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* in whatever means they feel necessary.
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*
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* @mask: event type and flags
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* @data: object that event happened on
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* @data_type: type of object for fanotify_data_XXX() accessors
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* @dir: optional directory associated with event -
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* if @file_name is not NULL, this is the directory that
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* @file_name is relative to
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* @file_name: optional file name associated with event
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* @inode: optional inode associated with event -
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* If @dir and @inode are both non-NULL, event may be
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* reported to both.
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* @cookie: inotify rename cookie
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*/
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int fsnotify(__u32 mask, const void *data, int data_type, struct inode *dir,
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const struct qstr *file_name, struct inode *inode, u32 cookie)
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|
{
|
|
const struct path *path = fsnotify_data_path(data, data_type);
|
|
struct super_block *sb = fsnotify_data_sb(data, data_type);
|
|
struct fsnotify_iter_info iter_info = {};
|
|
struct mount *mnt = NULL;
|
|
struct inode *inode2 = NULL;
|
|
struct dentry *moved;
|
|
int inode2_type;
|
|
int ret = 0;
|
|
__u32 test_mask, marks_mask;
|
|
|
|
if (path)
|
|
mnt = real_mount(path->mnt);
|
|
|
|
if (!inode) {
|
|
/* Dirent event - report on TYPE_INODE to dir */
|
|
inode = dir;
|
|
/* For FS_RENAME, inode is old_dir and inode2 is new_dir */
|
|
if (mask & FS_RENAME) {
|
|
moved = fsnotify_data_dentry(data, data_type);
|
|
inode2 = moved->d_parent->d_inode;
|
|
inode2_type = FSNOTIFY_ITER_TYPE_INODE2;
|
|
}
|
|
} else if (mask & FS_EVENT_ON_CHILD) {
|
|
/*
|
|
* Event on child - report on TYPE_PARENT to dir if it is
|
|
* watching children and on TYPE_INODE to child.
|
|
*/
|
|
inode2 = dir;
|
|
inode2_type = FSNOTIFY_ITER_TYPE_PARENT;
|
|
}
|
|
|
|
/*
|
|
* Optimization: srcu_read_lock() has a memory barrier which can
|
|
* be expensive. It protects walking the *_fsnotify_marks lists.
|
|
* However, if we do not walk the lists, we do not have to do
|
|
* SRCU because we have no references to any objects and do not
|
|
* need SRCU to keep them "alive".
|
|
*/
|
|
if (!sb->s_fsnotify_marks &&
|
|
(!mnt || !mnt->mnt_fsnotify_marks) &&
|
|
(!inode || !inode->i_fsnotify_marks) &&
|
|
(!inode2 || !inode2->i_fsnotify_marks))
|
|
return 0;
|
|
|
|
marks_mask = sb->s_fsnotify_mask;
|
|
if (mnt)
|
|
marks_mask |= mnt->mnt_fsnotify_mask;
|
|
if (inode)
|
|
marks_mask |= inode->i_fsnotify_mask;
|
|
if (inode2)
|
|
marks_mask |= inode2->i_fsnotify_mask;
|
|
|
|
|
|
/*
|
|
* If this is a modify event we may need to clear some ignore masks.
|
|
* In that case, the object with ignore masks will have the FS_MODIFY
|
|
* event in its mask.
|
|
* Otherwise, return if none of the marks care about this type of event.
|
|
*/
|
|
test_mask = (mask & ALL_FSNOTIFY_EVENTS);
|
|
if (!(test_mask & marks_mask))
|
|
return 0;
|
|
|
|
iter_info.srcu_idx = srcu_read_lock(&fsnotify_mark_srcu);
|
|
|
|
iter_info.marks[FSNOTIFY_ITER_TYPE_SB] =
|
|
fsnotify_first_mark(&sb->s_fsnotify_marks);
|
|
if (mnt) {
|
|
iter_info.marks[FSNOTIFY_ITER_TYPE_VFSMOUNT] =
|
|
fsnotify_first_mark(&mnt->mnt_fsnotify_marks);
|
|
}
|
|
if (inode) {
|
|
iter_info.marks[FSNOTIFY_ITER_TYPE_INODE] =
|
|
fsnotify_first_mark(&inode->i_fsnotify_marks);
|
|
}
|
|
if (inode2) {
|
|
iter_info.marks[inode2_type] =
|
|
fsnotify_first_mark(&inode2->i_fsnotify_marks);
|
|
}
|
|
|
|
/*
|
|
* We need to merge inode/vfsmount/sb mark lists so that e.g. inode mark
|
|
* ignore masks are properly reflected for mount/sb mark notifications.
|
|
* That's why this traversal is so complicated...
|
|
*/
|
|
while (fsnotify_iter_select_report_types(&iter_info)) {
|
|
ret = send_to_group(mask, data, data_type, dir, file_name,
|
|
cookie, &iter_info);
|
|
|
|
if (ret && (mask & ALL_FSNOTIFY_PERM_EVENTS))
|
|
goto out;
|
|
|
|
fsnotify_iter_next(&iter_info);
|
|
}
|
|
ret = 0;
|
|
out:
|
|
srcu_read_unlock(&fsnotify_mark_srcu, iter_info.srcu_idx);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fsnotify);
|
|
|
|
static __init int fsnotify_init(void)
|
|
{
|
|
int ret;
|
|
|
|
BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 23);
|
|
|
|
ret = init_srcu_struct(&fsnotify_mark_srcu);
|
|
if (ret)
|
|
panic("initializing fsnotify_mark_srcu");
|
|
|
|
fsnotify_mark_connector_cachep = KMEM_CACHE(fsnotify_mark_connector,
|
|
SLAB_PANIC);
|
|
|
|
return 0;
|
|
}
|
|
core_initcall(fsnotify_init);
|